(19)
(11) EP 1 128 566 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.10.2003 Bulletin 2003/40

(43) Date of publication A2:
29.08.2001 Bulletin 2001/35

(21) Application number: 01101976.7

(22) Date of filing: 29.01.2001
(51) International Patent Classification (IPC)7: H04B 1/707
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 28.01.2000 US 494000

(71) Applicant: Intersil Corporation
Palm Bay, Florida 32905 (US)

(72) Inventors:
  • Webster, Mark
    Indian Harbour Beach, Florida 32937-4379 (US)
  • Nelson, George
    Merritt Island, Florida 32953 (US)
  • Halford, Steven
    Palm Bay, Florida 32907 (US)

(74) Representative: Fleuchaus, Leo, Dipl.-Ing. et al
Fleuchaus & Gallo, Melchiorstrasse 42
81479 München
81479 München (DE)

   


(54) Biased-corrected rake receiver for direct sequence spread spectrum waveform


(57) The performance of a RAKE receiver for indoor multipath WLAN applications on direct sequence spread spectrum signals having relatively short codeword lengths comprises a channel-matched filter and codeword correlator front end, plus a signal combiner to which the codeword correlation component is applied. The signal combiner is supplied with a bias-corrected input calculated by a distorted codeword signature (power) generator, which is operative to generate and store a set of N codeword power correction values. The signal combiner combines correction values into the codeword correlation for each potentially transmitted codeword Sk. This serves to correct each correlation codeword metric by a de-biasing power component |Sk|2 for the unequal multipath-based distortions of the codeword energies. The output of the signal combiner is coupled to a peak detector, which selects a minimum distance-based 'de-biased' output as the transmitted codeword.







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